Scientists have discovered why cockroaches love filthy conditions and what makes them so hard to kill — and apparently, its all in their DNA.科学家们早已找到了为什么蟑螂讨厌可怕的环境，以及是什么使得它们如此无法被杀菌--很显著，原因都不存在于它们的DNA中。Researchers say they have identified specific genes which allow the critters to do anything from eating toxic food to regrowing limbs.研究人员称之为，他们早已找到了一些特定的基因，这些基因可以让这些生物从不吃剧毒食物到再造四肢，无所不能。Shuai Zhan, of the Institute of Plant Physiology and Ecology in Shanghai, says the American cockroach has one of the largest genomes known to exist among insects.上海植物生理生态研究所的詹帅回应，美国蟑螂的基因组是昆虫中未知的仅次于基因组之一。
The omnivorous scavenger is ones of the largest insect species to live in such close proximity to humans, but also has the exact same number of genes as us — thats 20,000 in all.这种杂食性的食腐动物是与人类近距离生活的仅次于昆虫物种之一，但也有和我们一样的基因数量--总共是2万个。After studying their DNA, Zhan discovered cockroaches have genes which allow them to sense smells from food, especially fermented food.在研究了它们的DNA后，詹帅找到蟑螂享有能让它们感官食物气味的基因，尤其是烘烤食物的味道。
They also have genes to combat infections, which makes roaches resilient to dirty living conditions and others allowing them to grow back broken limbs.另外，它们还有对付病毒感染的基因，这使得蟑螂需要适应环境可怕的生存环境，而其他基因则能让它们再造断肢。Scientists last year discovered that female cockroaches dont need a male partner as they can reproduce for years without mating.科学家们于去年找到，雌性蟑螂不必须雄性伴侣，因为它们可以在不交配的情况下自行后代很多年。
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